public class computer {
    int x;
    int y;
    int sum;
    int product;
    int DifValue;
    int add(){
        sum = x + y;
        return sum;
    }
    int sub(){
        DifValue = x - y;
        return DifValue;
    }
    int mul(){
        product = x * y;
        return product;
    }

}
